Jolnir is a Frost Giant/Elf hybrid with immense magical power who hails from the realm Alfheim. Rather than use his power to rule, Jolnir used it instead to bring joy to children of the Nine Realms, giving them gifts, particularly to Midgard (Earth). Jolnir's antics became a blessed time to the people of the Realms, and they celebrated his merry making ways as a holiday, which came to be known by humans as Christmas. As well, Jolnir gained a new name from the children of Earth, Santa Claus.

Immortality:- His Frost Giant/Elf physiology has the power to not die nor be affected through disease, cellular decay, intoxication or age.

Ice Magic:- His Frost Giant side allows for him to have absolute control over the forces of cold, snow, winter or ice. Through practice he has absolute control over such a power.

Healing:- His Frost Giant/Elf physiology allows for him to heal any being of their illness, injury, infection, intoxication & disorder. This act of "rejuvenation" is often dubbed as a "Christmas Miracle".

Space-Time Manipulation:- Through his immense magical powers, he was able to slow down time to such a degree that time was almost halted. This is how he was able to deliver children of all the nine realms their presents in one night. He was even able to use such a power to teleport himself from one realm to another.

Pure Heart:- Though not indirectly a power, but despite Jolnir's immense powers which could allow him to achieve "Godhood" in a sense, he dedicated his existence to bringing joy to other beings of the nine realms. This extreme amount of humility is what makes him the most loved being in all of the nine realms. He didn't not even show or feel the slightest amount of anger even after Loki stole his power.

Happiness Inducement:- Though not indirectly a power, but bringing Happiness to all of the beings of the nine realms is Jolnir's main purpose in life & sometimes requires the use of some form of magic to work.